Question

complete the table to compare these structures.
amino acid monosaccharide
is a building block of cellulose
contains hydrogen
has a carboxyl group

Explanation:

• Cellulose is a polysaccharide (complex carbohydrate), and its building block is a monosaccharide (glucose). So for "Is a building block of cellulose", only monosaccharide should be checked.
• Amino acids and monosaccharides both contain hydrogen atoms as part of their molecular structure. So for "Contains hydrogen", both should be checked.
• Amino acids have a carboxyl group (-COOH) as part of their basic structure. Monosaccharides do not have a carboxyl group (they have hydroxyl groups -OH and carbonyl groups -C=O). So for "Has a carboxyl group", only amino acid should be checked.

Answer:

• Is a building block of cellulose: Amino acid - no, Monosaccharide - yes.
• Contains hydrogen: Amino acid - yes, Monosaccharide - yes.
• Has a carboxyl group: Amino acid - yes, Monosaccharide - no.